Quasi-three-dimensional numerical simulation of a solid oxide fuel cell short stack: Effects of flow configurations including air-flow alternation
| Autor: | Hideo Yoshida, Masashi Kishimoto, Wee Choon Tan, Hiroshi Iwai |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
Computer simulation Renewable Energy Sustainability and the Environment Airflow Flow (psychology) Energy Engineering and Power Technology 02 engineering and technology Mechanics 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Aspect ratio (image) 0104 chemical sciences Stack (abstract data type) Solid oxide fuel cell Electrical and Electronic Engineering Physical and Theoretical Chemistry 0210 nano-technology Current density Voltage |
| Zdroj: | Journal of Power Sources. 400:135-146 |
| ISSN: | 0378-7753 |
| DOI: | 10.1016/j.jpowsour.2018.08.002 |
| Popis: | The effects of flow configuration in solid oxide fuel cell (SOFC) stacks are investigated using a quasi-three-dimensional numerical model. Flow configurations with alternated air flows in parallel and perpendicular to the fuel flows are considered in addition to the conventional co-, counter-, and cross-flow configurations. The stacks have eight cells with unity aspect ratio and an active area of 4900 mm2 and are compared at fuel utilization of 0.193, 0.386, 0.579, and 0.772. The numerical model is capable of analyzing both the streamwise and spanwise directions of the cells. Although the counter-flow stack achieves the highest voltage efficiency among the stacks with the conventional flow configurations, it has the highest dispersion of the current density distribution on the cells. Air-flow alternation is effective to achieve uniform and high cell temperature and hence low dispersion of the current density. Alternate air flows parallel to the fuel flows achieve the highest voltage efficiency of 0.797 at a fuel utilization of 0.772, while alternate air flows perpendicular to the fuel flows reduce the risk of local fuel depletion as compared with the cross-flow stacks. Appropriate selection of the air-flow configuration within stacks allows operation at higher efficiency without fuel depletion. |
| Databáze: | OpenAIRE |
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